Regarding Krenshars: Interesting monster. One question, the skin pull back has an effect, and the skin pull back and shriek combination create the Fear effect, but does the shriek by itself have an effect?

I honestly do not know. I relayed most of the text from the 3.5 MM and did not mention the shriek by itself. My personal thought would be that either the face flip or the shriek would accomplish the intimidation scare effect. I believe that was my thought process while writing the last line of the last paragraph in the combat section; both effects are unnerving, but alone (and after recovering from the fear effect) not magical, just super scary.

"He surrendered? sorry, I didn't hear it; I was too busy chopping off his head."